Single-unit analysis of somatosensory processing in the core auditory cortex of hearing ferrets

The European Journal of Neuroscience
M Alex Meredith, Brian L Allman

Abstract

The recent findings in several species that the primary auditory cortex processes non-auditory information have largely overlooked the possibility of somatosensory effects. Therefore, the present investigation examined the core auditory cortices (anterior auditory field and primary auditory cortex) for tactile responsivity. Multiple single-unit recordings from anesthetised ferret cortex yielded histologically verified neurons (n = 311) tested with electronically controlled auditory, visual and tactile stimuli, and their combinations. Of the auditory neurons tested, a small proportion (17%) was influenced by visual cues, but a somewhat larger number (23%) was affected by tactile stimulation. Tactile effects rarely occurred alone and spiking responses were observed in bimodal auditory-tactile neurons. However, the broadest tactile effect that was observed, which occurred in all neuron types, was that of suppression of the response to a concurrent auditory cue. The presence of tactile effects in the core auditory cortices was supported by a substantial anatomical projection from the rostral suprasylvian sulcal somatosensory area. Collectively, these results demonstrate that crossmodal effects in the auditory cortex are not exclusi...Continue Reading

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Citations

Jun 14, 2016·Hearing Research·M Alex Meredith, Stephen G Lomber
Sep 7, 2016·NeuroImage·Zhe Charles ZhouWei Gao
Jan 25, 2017·Hearing Research·Michinori KubotaJunsei Horikawa
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Jun 26, 2021·Nature Communications·Michael LohseAndrew J King
Jun 29, 2021·Frontiers in Neuroscience·Mark D Fletcher, Carl A Verschuur

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